CN103386673A - Power tool - Google Patents
Power tool Download PDFInfo
- Publication number
- CN103386673A CN103386673A CN2013101672849A CN201310167284A CN103386673A CN 103386673 A CN103386673 A CN 103386673A CN 2013101672849 A CN2013101672849 A CN 2013101672849A CN 201310167284 A CN201310167284 A CN 201310167284A CN 103386673 A CN103386673 A CN 103386673A
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- China
- Prior art keywords
- motor
- switch element
- temperature sensor
- retaining member
- temperature
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/68—Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/008—Cooling means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Portable Power Tools In General (AREA)
- Motor Or Generator Cooling System (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
A power tool (11) includes a motor (15), a gear mechanism (19) that changes the speed of an output of the motor (15), a drive circuit (47) including a switching element (40) that controls power supplied to the motor (15), a housing (12) that accommodates the motor (15), a fixture (37) that fixes the motor (15) to the housing (12), and a temperature sensor (43) that measures a temperature of the switching element (40). The drive circuit (47) stops supplying power to the motor (15) when the temperature measured by the temperature sensor (43) reaches a predetermined temperature. The fixture (37) functions to radiate heat from the switching element (40).
Description
Technical field
The present invention relates to a kind of electric tool that comprises the motor of the drive source that is used as front end tool.
Background technology
TOHKEMY 2010-214520 and Japanese kokai publication sho 60-207776 disclose separately a kind of utilization and have driven the electric tool of front end tool as the motor of drive source.TOHKEMY 2010-214520 (the 0020th, 0033 and 0054 section, and Fig. 1 and 2) has illustrated a kind of switch element of motor, gear mechanism, motor drive circuit and electric tool of temperature sensor of comprising.Gear mechanism carries out speed change to the rotation of motor output, and will rotate to export and be sent to the rotation output unit that front end tool is installed.The temperature of temperature sensor measurement switch element.When the temperature of the measured switch element of temperature sensor becomes higher than set temperature, electric tool restriction or stop the rotation that is produced by motor.Motor comprises output shaft.Fan is linked to output shaft.In motor, rotate fan to produce the air-flow of cold switch element.Switch element is fixed to same radiating component, and is assemblied on circuit substrate.In addition, switch element and motor clamping circuit substrate and are configured in the both sides of circuit substrate.
Japanese kokai publication sho 60-207776 (left column (claim 2) of the 1st page, the 4th page lower-left row, Fig. 9 and 11) has illustrated a kind of electric tool that utilizes the temperature of temperature sensor measurement switch element (TRIAC (triac)).This electric tool is controlled the rotating speed of motor and stops motor based on measured temperature.Use support switch element to be linked to the stator of motor.Temperature sensor is linked to switch element or support.
In the electric tool of TOHKEMY 2010-214520, the air-flow that fan produces flows to motor from switch element.Cooling like this switch element and motor.Yet radiating component is exclusively used in switch element, therefore can not dispel the heat to motor.In addition, in the electric tool of Japanese kokai publication sho 60-207776, by support, switch element is linked to stator.Therefore, the heat of motor has hindered the cooling of switch element.
Like this, in the electric tool of TOHKEMY 2010-214520 and Japanese kokai publication sho 60-207776, cooling effect is different between switch element and motor.Therefore, when switch element being detected and stop supply of electric power to motor when overheated, the temperature of motor may be less than or equal to allows limit temperature or may be greater than allowing limit temperature.
Summary of the invention
The purpose of this invention is to provide a kind of element of cold switch effectively and based on the measurement temperature of switch element, correctly stop to the electric tool of the supply of electric power of motor.
To achieve these goals, one aspect of the present invention provides a kind of electric tool, comprising: motor; Gear mechanism, for the speed of the output that changes described motor; Drive circuit, it comprises for controlling to the switch element of the supply of electric power of described motor; Housing, be used for holding described motor; Fixture, be used for described motor is fixed to described housing; And temperature sensor, for the temperature of measuring described switch element.In the situation that the measured temperature of described temperature sensor reaches predetermined temperature, described drive circuit stops the supply of electric power to described motor.Described fixture is used for the heat from described switch element is shed.
In electric tool according to the present invention, preferably, described fixture comprises: the motor retaining member, be used for keeping described motor, and fixed component, it extends from described motor retaining member, and is used for keeping described switch element.
Also comprise the fan unit on the output shaft that is configured in described motor according to electric tool of the present invention.Described fan unit produces the air-flow that is used for cooling described motor retaining member, and described air-flow also flows through described fixed component and the cooling described switch element that extends from described motor retaining member.
In electric tool according to the present invention, preferably, described motor retaining member is with acting on the fan cover that covers described fan unit; And the downstream direction of the air-flow that produces towards described fan unit from described motor retaining member of described fixed component extends.
In electric tool according to the present invention, preferably, the side face of described fixed component and described motor has been separated by for the gap of the stream that forms described air-flow, and along this side face, extends.Described fixed component comprises in the face of the first surface of the side face of described motor with back to second of the side face of described motor, and described switch element is configured on described second.
The invention provides a kind of element of cold switch effectively and based on the measurement temperature of switch element, suitably stop to the electric tool of the supply of electric power of motor.
By below in conjunction with accompanying drawing, utilize the explanation shown in the example of principle of the present invention, it is obvious that other aspects and advantages of the present invention will become.
Description of drawings
By below in conjunction with the explanation of accompanying drawing to currently preferred embodiment, can understand best the present invention and purpose and advantage, wherein:
Fig. 1 is the cross-sectional side view of electric tool according to an embodiment of the invention;
Fig. 2 is the perspective view that the motor in the electric tool of Fig. 1 is shown;
Fig. 3 is the schematic partial sectional view of the electric tool of Fig. 1;
Fig. 4 is illustrating of intercepting of the line A-A along Fig. 3 for switch element and temperature sensor being linked to the schematic cross-sectional view of the structure of heat sink;
Fig. 5 is the circuit diagram of the electric tool of Fig. 1;
Fig. 6 is the schematic cross-sectional view that the connecting structure of the temperature sensor in variation is shown;
Fig. 7 is the schematic cross-sectional view that the connecting structure of the temperature sensor in the variation that is different from Fig. 6 is shown;
Fig. 8 is the schematic cross-sectional view that the connecting structure of the temperature sensor in the variation that is different from Fig. 7 is shown;
Fig. 9 is the schematic cross-sectional view that the connecting structure of the temperature sensor in the variation that is different from Fig. 8 is shown; And
Figure 10 is the schematic cross-sectional view that the connecting structure of the temperature sensor in the variation that is different from Fig. 9 is shown.
The specific embodiment
Refer now to Fig. 1～5 explanation electric tools according to an embodiment of the invention.
With reference to figure 1, the electric tool 11 of the present embodiment is hand-held, and for example is used as the electric screw fastener driving apparatus of the reinforcement of concrete.Body shell 12 forms the shell of electric tool 11.Body shell 12 comprises stem portion 13 and handle part 14.Stem portion 13 is for column and have blind end.Handle part 14 (from Fig. 1, being viewed as downwards) on the direction that the axle with stem portion 13 intersects extends.The body shell 12 of the present embodiment is an example of shell.
Gear 20 (pinion) is configured on the outstanding output shaft 16 of end face with respect to cooling fan unit 17 (being right side in Fig. 1).Gear mechanism 19 comprise with gear 20 meshed gears 21, with the power transmission shaft 22 of gear 21 coaxial rotation, be configured in power transmission shaft 22 an end gear 23 and with gear 23 meshed gears 24.Speed change is carried out in 19 pairs of rotations that send from motor 15 of gear mechanism, and with the rotating speed after speed change, rotation output unit 25 is rotated.Rotation output unit 25 is linked to the far-end (being right part in Fig. 1) of stem portion 13.Bayonet socket 25a is configured in the far-end that rotates output unit 25.In removable mode, front end tool 26 is mounted to bayonet socket 25a.Front end tool 26 and rotation output unit 25 coaxial rotation.
In removable mode, box-like battery pack case 30 is linked to the lower end of handle part 14.Battery pack case 30 holds the battery pack 31 as rechargeable battery.Battery pack 31 is held rechargeable cell 31a.Electric tool 11 is rechargeable, and uses the driving power of battery pack 31 as electric tool 11.
In addition, as shown in Figure 1, circuit board 32 is configured in the lower end near handle part 14 in handle part 14.Circuit board 32 is controlled motor 15.Trigger switch 28 is electrically connected to motor 15 with circuit board 32.
As shown in Figures 1 to 3, motor 15 comprises be used to the cylindrical shell 15a that holds stator 15b, rotor 15c (with reference to figure 2) and rotary magnetic field generation coil (not shown).As mentioned above, motor 15 can be also brushless motor, and electric tool 11 comprises for the keeper 34 that keeps the brush 33 shown in Fig. 1 and 3.The brush 33 comprise keeper 34 that keep with the contacted distal portion of commutator 35, wherein, commutator 35 is embedded to the rearward end (from Fig. 1, being viewed as left part) of turning cylinder 15d (with reference to figure 3).The wire 36 that extends from trigger switch 28 is electrically connected to keeper 34.By trigger switch 28 and wire 36 from battery pack 31 to motor 15 supply electric power.Turning cylinder 15d's is output shafts 16 with respect to motor 15 outstanding parts.
By metal fixture 37 with the partial fixing of the outlet side of motor 15 to body shell 12.Fixture 37 is column, and has sealed end.The axis hole (not shown) connects the central portion of sealed end.More specifically, be configured in bearing (not shown) in the axis hole of fixture 37 and support the output shaft 16 of motor 15.The screw rod (not shown) is fixed on fixture 37 pre-position in the stem portion 13 of body shell 12.Output shaft 16 connects fixture 37, and is linked to gear mechanism 19.
When producing the air-flow towards motor 15, the cooling fan unit 17 shown in Fig. 1～3 rotates cooling fan 18 when drive motor 15.Cool stream makes such as the assembly of the motor 15 of coil and brush 33 grades cooling.Fixture 37 is also with acting on the fan cover that holds cooling fan 18.More specifically, the fixture 37 of cooling fan unit 17 comprises motor retaining member 38 and heat sink 39.Act on as column and motor retaining member 38 use with sealed end the fan cover that holds cooling fan 18.Heat sink 39 comprises the basal part of a position on the side face that is fixed to motor retaining member 38.In addition, heat sink 39 is square, and the downstream direction of the air-flow that produces towards cooling fan 18 abreast with the axle of motor 15 extends.The screw rod (not shown) can be fastened to the basal part of heat sink 39, so that heat sink 39 is fixed on the side face of motor retaining member 38.Instead, heat sink 39 and motor retaining member 38 can be formed.In the present embodiment, heat sink 39 is examples of fixed component.
Along circumferentially form opening 38a on the side face of motor retaining member 38.Opening 38a is with acting on during the rotation of cooling fan 18 suction inlet in air intake fixture 37.Motor retaining member 38 has the form of cylindrical shell, and wherein, this cylindrical shell has sealed end and usually covers cooling fan 18.Therefore, motor retaining member 38 is used for preventing cooling fan unit 17 that dust that cooling fan 18 sucks from outside causes and the fault of motor 15.
As shown in Figures 1 to 3,15 side face extends heat sink 39 from motor retaining member 38 along motor.Heat sink 39 has been separated by and has been used for the predetermined gap of formation from the stream of the air-flow of cooling fan 18 with the side face of motor 15.Switch element 40 is linked to the surface back to motor 15 (outer surface) of heat sink 39.Switch element 40 is adjusted the electric power of supplying to motor 15.In the present embodiment, switch element 40 is normally such as the cubic tabular assembly of field-effect transistor (FET) etc.
As shown in Figures 2 and 3, heat sink 39 is longer and wider than switch element 40.Switch element 40 is linked to heat sink 39, so that the link surface of switch element 40 contacts fully with the outer surface of heat sink 39.In this example, screw rod 41 be inserted in an end of switch element 40 in formed patchhole and be fastened to formed screwed hole (not shown) in heat sink 39, so that switch element 40 is fixed to heat sink 39.
The fixture 37 of the present embodiment is formed from the material that switch element 40 easily dispels the heat to outside by having super heat dissipation characteristics and allowing.The material of fixture 37 can be the metal such as aluminium, steel, copper, aluminium alloy, steel alloy (for example, stainless steel) or copper alloy etc.The motor retaining member 38 and the heat sink 39 that form fixture 37 can be made by same material or different materials, as long as heat dissipation characteristics well.
, with reference to figure 2, three wires 42 are connected to respectively three terminal (not shown) of switch element 40.These three wires 42 connect handle part 14, and are electrically connected to circuit board 32 (not shown).The supply of electric power that circuit board 32 is controlled to motor 15 by switch element 40, thereby rotation and the torque of control motor 15.
As shown in Figures 2 and 3, temperature sensor 43 (for example, thermal resistor) is linked to switch element 40 on the surperficial relative surface with being linked to heat sink 39.Wire 44 is electrically connected to circuit board 32 (with reference to figure 1) with temperature sensor 43.Temperature sensor 43 is measured (detection) and is fixed to the temperature of the switch element 40 of heat sink 39.Temperature while measuring temperature T d for estimation motor 15 output high torque (HT).The measurement temperature T d that circuit board 32 receives from temperature sensor 43.When measurement temperature T d reached the predetermined threshold Ts of expression motor 15 overloads (overheated), circuit board 32 disconnected switch element 40, and stopped to motor 15 supply electric power.
Fig. 4 is the schematic cross-sectional view that the line A-A along Fig. 3 intercepts, and illustrates for the structure that links heat sink 39, switch element 40 and temperature sensor 43.As shown in Figure 4, under the link surface of switch element 40 and state that the outer surface (from Fig. 4, being viewed as lower surface) of heat sink 39 contacts, switch element 40 is linked to heat sink 39.In addition, under the state of the Surface Contact of the link surface of temperature sensor 43 and the switch element 40 relative with this link surface, temperature sensor 43 is linked to switch element 40.The heat of switch element 40 is passed to heat sink 39.The cold switch element 40 so effectively.
When to motor 15 supply electric power, the magnitude of current that flows through switch element 40 is identical with the magnitude of current that flows through motor 15, and switch element 40 has the heating trend identical with motor 15.Switch element 40 is linked to the cool stream that is produced by cooling fan 18 together with motor 15 and carries out cooling fixture 37.Like this, switch element 40 and motor 15 are shared the fixture 37 that is used for heat radiation.Therefore, the heat history of the heat history of motor 15 and switch element 40 has relative strong positive correlation.Even, like this based on the measurement temperature T d of switch element 40 and stop the supply of electric power of motor 15, also make when motor 15 is in overload (overheated) and can suitably stop supply of electric power.
Refer now to the electrical configurations that Fig. 5 illustrates electric tool 11.
The battery B that consists of battery pack 31 comprises the positive terminal that is connected in series with trigger switch 28.When operation frizzen 27, connect (closure) trigger switch 28.Provide connection signal (operation signal) to control circuit 45 like this.When shut-down operation frizzen 27, make trigger switch 28 disconnect (opening).Provide cut-off signal (operation stop signal) to control circuit 45 like this.
In addition, as shown in Figure 5, selector switch 46 is connected to trigger switch 28, and is connected in parallel to motor 15.Selector switch 46 consists of one group of two switch, and wherein, one of them comprises the positive terminal that is connected with frizzen 27 two switches, and another comprises the negative terminal that is connected with the drain terminal of switch element 40.These two switches are switched, so that one of them is connected to positive terminal and another is connected to negative terminal.When selector 29 is configured in the forward rotation chosen position, selector switch 46 is switched to the forward rotation shown in the solid line of Fig. 5 and connect.Apply to motor 15 voltage that produces forward rotation like this.When selector 29 is configured in the backward rotation chosen position, selector switch 46 is switched to the backward rotation shown in the dotted line of Fig. 5 and connect.Apply and produce counter-rotational voltage to motor 15 like this.
The source terminal of switch element 40 is connected to the negative terminal of battery B.In addition, the gate terminal of switch element 40 is connected to control circuit 45.When control circuit 45 received operation signal from trigger switch 28, control circuit 45 was provided for controlling the Motor Control signal (grid on/off signal) of the action of motor 15 to the gate terminal of switch element 40.Switch on and off switch element 40 in response to this Motor Control signal.Based on switching on and off of switch element 40,15 supply DC (direct current) voltages from battery B to motor.
More specifically, control circuit 45 turn on-switch elements 40 are in order to motor 15, with maximum output, driving and rotate, and make switch element 40 disconnect stopping the rotation of motor 15.In addition, control circuit 45 carries out pulse width modulation (PWM) with driving switch element 40 and controls the rotating speed of motor 15.When forward end instrument 26 applied large torque, control circuit 45 used known control system (Fig. 5 is not shown) automatically improve the dutycycle of switch element 40 and increase to the electric current of motor 15 supplies.In the present embodiment, the drive circuit 47 that comprises control circuit 45 (circuit board 32) and switch element 40 is examples that comprise the drive circuit of switch element.
In the electric tool 11 that comprises circuit shown in Figure 5, the front end tool 26 that the user will expect is mounted to bayonet socket 25a, and holds handle part 14.Then, the user utilizes selector 29 to select forward rotation direction or the backward rotation direction of front end tool 26.The operation of frizzen 27 has driven motor 15, and with given torque, makes and be mounted to front end tool 26 rotations of rotating output unit 25.
The identical magnitude of current flows through switch element 40 and motor 15.Make like this switch element 40 heatings.Therefore, the measured temperature T d of temperature sensor 43 makes it possible to infer when motor 15 reaches overload.When measuring temperature T d and reach threshold temperature Ts as an example of predetermined temperature, control circuit 45 is judged as (being speculated as) motor 15 and is in overload, and cut-off switch element 40., even the disconnection of switch element 40 makes when operation frizzen 27 and connection trigger switch 28, also stop stopping drive motor 15 to motor 15 supply electric power and pressure.
The operation of electric tool 11 now is described.
The operation of frizzen 27 has driven electric tool 11 and has made front end tool 26 rotate to utilize front end tool 26 to execute the task.When front end tool 26 is the impacting front end tool, utilize fastener driving apparatus that the concrete screw rod is fastened to concrete.When front end tool 26 is the hole drilling type front end tool, utilize drill to punch in concrete.
When operation frizzen 27, gear mechanism 19 makes the rotating speed speed change of the output shaft 16 of motor 15, and with the rotating speed after speed change, makes and rotate output unit 25 rotations.The front end tool 26 that is mounted to bayonet socket 25a is rotated.Here, motor 15, according to the connected mode of the selector switch 46 corresponding with the chosen position of selector 29, produces forward rotation or backward rotation.
When driving electric tool 11, the rotation of motor 15 makes fan 18 that rotation occur, and passes through the opening 38a air amount of motor retaining member 38.The air that sucks has formed towards the air-flow of motor 15 with cool motors 15 and brush 33 grades.In this case, by the side face Flow Structure Nearby at motor retaining member 38 and enter opening 38a air, flow through the air of motor retaining member 38 inside and flow to the air of motor 15 from cooling fan 18 via heat sink 39, carry out Cooling fixture 37.
In addition, when the electric current that flows through coil makes motor 15 adstante febres, the electric current of same amount flows through switch element 40.Therefore, make switch element 40 heatings in the mode identical with motor 15.Because switch element 40 is fixed to heat sink 39 by the cooling fixture of air-flow, so heat is passed to fixture 37 from switch element 40.So effectively cooling switch element 40.In addition, heat is passed to the air-flow that flows to motor 15 from cooling fan 18 from motor 15.Also heat is passed to fixture 37 from the output shaft 16 of motor 15.
There is gap between the side face of heat sink 39 and motor 15.This gap is configured for the stream of air-flow, wherein, and this air-flow and heat sink 39 exchanged heats, thereby cooling heat dissipation plate 39.So further heat is passed to heat sink 39 effectively from switch element 40, and further improves the cooling effect of switch element 40.In addition, because there are gap in heat sink 39 and the side face of motor 15, so the radiant heat that heat sink 39 receives from motor 15, thereby with motor 15 exchanged heats.Like this, the radiating component that shared as motor 15 and switch element 40 of heat sink 39.Therefore, the heat history of the heat history of switch element 40 and motor 15 has relative strong positive correlation.
When driving electric tool 11, the temperature of temperature sensor 43 measuring switch elements 40.Control circuit 45 judgement is measured temperature T d and whether has been reached threshold temperature Ts (Td 〉=Ts).When being judged as when measuring temperature T d and having reached threshold temperature Ts, control circuit 45 disconnects switch element 40, and stops to the supply of electric power of motor 15.Having suppressed like this may be by the overheated fault that causes such as what shorten service life etc.In addition, the situation below having avoided: when measuring temperature T d and reach threshold temperature Ts and control circuit 45 and stop supply of electric power to motor 15, the temperature of motor 15 significantly allows limit temperature lower than allowing limit temperature or being significantly higher than.
The advantage of the present embodiment now is described.
(1) switch element 40 is linked to metal fixture 37, wherein, metal fixture 37 is fixed to body shell 12 with motor 15.As a result, fixture 37 is used for the heat from switch element 40 is shed.Therefore, fixture 37 is used for making from the two heat of motor 15 and switch element 40 and sheds.Therefore, the heat history of the heat history of motor 15 and switch element 40 has relative strong positive correlation.Even, like this based on the measurement temperature T d of switch element 40 and stop to the supply of electric power of motor 15, also can suitably stop to the supply of electric power of motor 15 when motor 15 is overheated.In addition, effectively cooling switch element 40.
(2) fixture 37 is fixed to body shell 12 with the outlet side of motor 15, and comprises for the motor retaining member 38 of maintenance motor 15 and the heat sink 39 that extends from motor retaining member 38.Switch element 40 is linked to heat sink 39., due to peripheral assembly or the shape of switch element 40, may be difficult to the surface that provides motor retaining member 38 to be linked to motor retaining member 38 is interior.Yet, extend from motor retaining member 38 by making heat sink 39, can obtain for the space that links switch element 40.In addition, heat sink 39 has shape and the size that the whole surface that makes switch element 40 contacts with heat sink 39.Therefore, most of link surface of switch element 40 can contact with heat sink 39, and can obtain from switch element 40 to heat sink 39 larger area of heat transfer.In addition, heat sink 39 is to extend with respect to motor retaining member 38 outstanding modes.Therefore, this outstanding shape has obtained the relatively wide surface area of heat sink 39.So also improved the cooling effect of switch element 40.
(3) cooling fan 18 (fan unit) that is linked to the output shaft 16 of motor 15 has produced the air-flow that is used for cool motors retaining member 38 and utilizes the heat sink 39 cold switch elements 40 that extend from motor retaining member 38.
(4) downstream direction of the air-flow that produces from the motor retaining member 38 as the fan cover of cooling fan 18 towards cooling fan 18 of heat sink 39 extends.The further like this effect that is used for the switch element 40 on cooling heat dissipation plate 39 that improved.
(5) heat sink 39 and the side face of motor 15 have been separated by and have been configured for gap from the stream of the air-flow of cooling fan 18, and along the side face of motor 15, extend.Switch element 40 is linked to heat sink 39 on the surface of motor 15.Therefore, heat sink 39 is used for making from the two heat of motor 15 and switch element 40 and sheds.Therefore, when the temperature of motor 15 is high and heat sink 39 when hot, the two radiating efficiency of motor 15 and switch element 40 reduces.When the temperature of heat sink 39 is low, will effectively be passed to heat sink 39 from the two heat of motor 15 and switch element 40.Therefore, the temperature of the temperature of motor 15 and switch element 40 has the positive correlation of more strengthening.Even like this based on the measurement temperature T d of switch element 40 and stop to the supply of electric power of motor 15, also can suitably stop when motor 15 is overheated to motor 15 supply of electric power.
(6) the temperature sensor 43 surperficial relative surface that links with switch element 40 that is linked to heat sink 39.Obtain like this than large contact surface, amassing between temperature sensor 43 and switch element 40, and will effectively be passed to temperature sensor 43 from the heat of switch element 40.Improved like this sensitivity of temperature sensor 43.
Obviously, to those skilled in the art,, in the situation that do not break away from the spirit or scope of the present invention, can realize the present invention with many other particular forms.Especially, should be appreciated that and can realize the present invention with following form.
In the above-described embodiments, as shown in Figure 6, can apply lubricant 51 between switch element 40 and temperature sensor 43.Form this lubricant 51 by the material with high-termal conductivity.Improved like this sensitivity of temperature sensor 43, and made it possible to measure temperature with high response.
The structural change of above-described embodiment can be become structure shown in Figure 7.In this case, apply between switch element 40 and temperature sensor 43 by the formed lubricant 51 of the material with high-termal conductivity.Heatproof zone 52 covers temperature sensor 43.Metallic foil 53 is whole covering temperature sensor 43 and switch element 40 from the outside of heatproof zone 52.Apply between metallic foil 53 and heat sink 39 by the formed lubricant 51 of the material with high-termal conductivity.In addition, the temperature sensor 43 that covers of metallic foil 53 and switch element 40 outer surface that is linked to heat sink 39.In this structure, utilize metallic foil 53 that temperature sensor 43 is fixed to switch element 40, and need not screw rod and instrument.Therefore, the task for junction temperatures sensor 43 is relatively simple.In addition, the application of metallic foil 53 makes it possible to maintained switch element 40 and contacts with temperature sensor 43, and except contact-making surface, can also heat be passed to temperature sensor 43 from switch element 40 by metallic foil 53.The further like this sensitivity that improves temperature sensor 43, and make it possible to measure temperature with higher response.In addition, can will be passed to from the heat of switch element 40 contact-making surface between switch element 40 and heat sink 39 by metallic foil 53.In addition, the surface that contacts with heat sink 39 (fixture 37) is applied lubricant 51.Improved like this effect of cold switch element 40.
Metallic foil 53 can be for example aluminium strip, copper strips or stainless steel band.In addition, be not limited to metallic foil.Replace metallic foil 53, can use any flexible member with superior heat conductivity such as metal sheet etc.In addition, this flexible member is also nonessential consists of metal.This flexible member can consist of the synthetic of the resin with high-termal conductivity or resin and other material, as long as can obtain superior heat conductivity.This synthetic can be the resin that comprises metal dust or ceramic powders.Another example of this synthetic is the duplexer such as stacked film etc. of metal and resin.In these cases, heat is passed to temperature sensor 43 from switch element 40 effectively.In addition, improved the sensitivity of temperature sensor 43, and can carry out detected temperatures with high responsiveness.Can use insulating tape as heatproof zone 52.
In the above-described embodiments, as shown in Figure 8, can use adhesive 54 interfix temperature sensor 43 and switch element 40.In this case, preferred adhesive 54 is formed by the material with elasticity and high-termal conductivity.Separating of the temperature sensor 43 that the impact load that this structure has produced while having prevented from using electric tool 11 and vibrating may cause, and improved the sensitivity of temperature sensor 43.In addition, when utilizing the fastening temperature sensor 43 of screw rod, the vibration of electric tool 11 may cause screw bolt loosening.May form like this gap of the sensitivity that reduces temperature sensor 43.Yet when utilizing adhesive 54 fastening temperature sensor 43, this class problem can not occur.
As shown in Figure 9, can add elastomer 55 to push temperature sensor 43 to switch element 40.This structure has increased the maintenance intensity of temperature sensor 43 and switch element 40.In addition, elastomer 55 applies for the pressure that keeps temperature sensor 43 to contact with switch element.Because temperature sensor 43 can not separate with switch element 40, so can be in the situation that can not reduce the temperature of the sensitivity measuring switch element 40 of temperature sensor.In addition, even when electric tool 11 vibration is violent, temperature sensor 43 can not separate with switch element 40 yet.
As shown in figure 10, can configure contiguously flank 56 with temperature sensor 43.Flank 56 presses to switch element 40 with temperature sensor 43 brute forces.Prevented that like this temperature sensor 43 from separating with switch element 40.
Motor has been not limited to the brush motor, and can be brushless motor.When using brushless motor, the switch element in the drive circuit of motor is linked to for motor being fixed to the fixture of housing, and temperature sensor is configured on switch element.Obtained like this advantage identical with the brush motor is arranged.
In the above-described embodiments, when motor does not comprise cooling fan 18, switch element is linked to for motor 15 being fixed to the fixture of body shell 12.The temperature of temperature sensor measurement switch element.
Switch element can be configured on the side face of the upper or fixture 37 of the front end face (from Fig. 3, being viewed as right side) of fixture 37 of the outlet side that is positioned at motor 15.In addition, the fixture for motor being fixed to body shell can be configured in the rear side (opposite side of outlet side) of motor, and switch element 40 can be linked to this fixture.
Electric tool can be rechargeable type.Electric tool can also be utilize AC (interchange) power supply non-rechargeable.
In the above-described embodiments, use and be used for concrete electric screw fastener driving apparatus as electric tool.Yet, be not limited to the electric screw fastener driving apparatus, and the present invention also can be applicable to use any electric tool of motor as drive source.For example, the present invention can be applicable to impact fastener driving apparatus, jumper boring bar, impact wrench, annular saw, jigsaw, screw rod fastener driving apparatus, vibration fastener driving apparatus, pulverizer and ail gun etc.In this case, electric tool is not limited to for concrete, and the subject material of electric tool can be timber, plastics, metal and pottery etc.
These examples and embodiment should be considered to exemplary and and nonrestrictive, and the present invention is not limited to details given here, in the scope and equivalent structure thereof of appended claims, can modify to the present invention.
Claims (5)
1. electric tool comprises:
Motor;
Gear mechanism, for the speed of the output that changes described motor;
Drive circuit, it comprises for controlling to the switch element of the supply of electric power of described motor;
Housing, be used for holding described motor;
Fixture, be used for described motor is fixed to described housing; And
Temperature sensor, for the temperature of measuring described switch element,
Wherein, in the situation that the measured temperature of described temperature sensor reaches predetermined temperature, described drive circuit stops the supply of electric power to described motor, and
Described fixture is used for the heat from described switch element is shed.
2. electric tool according to claim 1, wherein, described fixture comprises:
The motor retaining member, be used for keeping described motor; And
Fixed component, it extends from described motor retaining member, and is used for keeping described switch element.
3. electric tool according to claim 2, wherein, also comprise the fan unit on the output shaft that is configured in described motor,
Wherein, described fan unit produces the air-flow that is used for cooling described motor retaining member, and described air-flow also flows through described fixed component and the cooling described switch element that extends from described motor retaining member.
4. electric tool according to claim 3, wherein,
Described motor retaining member is with acting on the fan cover that covers described fan unit; And
Described fixed component extends from the downstream direction of the air-flow that described motor retaining member produces towards described fan unit.
5. according to claim 3 or 4 described electric tools, wherein,
The side face of described fixed component and described motor has been separated by for the gap of the stream that forms described air-flow, and along this side face, extends,
Described fixed component comprises in the face of the first surface of the side face of described motor with back to second of the side face of described motor, and
Described switch element is configured on described second.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-108540 | 2012-05-10 | ||
| JP2012108540A JP5938652B2 (en) | 2012-05-10 | 2012-05-10 | Electric tool |
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| Publication Number | Publication Date |
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| CN103386673A true CN103386673A (en) | 2013-11-13 |
| CN103386673B CN103386673B (en) | 2016-06-22 |
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| CN201310167284.9A Active CN103386673B (en) | 2012-05-10 | 2013-05-08 | Electric tool |
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| Country | Link |
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| US (1) | US9407195B2 (en) |
| EP (1) | EP2662187B1 (en) |
| JP (1) | JP5938652B2 (en) |
| CN (1) | CN103386673B (en) |
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| JP2013233631A (en) | 2013-11-21 |
| JP5938652B2 (en) | 2016-06-22 |
| CN103386673B (en) | 2016-06-22 |
| EP2662187A2 (en) | 2013-11-13 |
| US9407195B2 (en) | 2016-08-02 |
| EP2662187A3 (en) | 2015-08-12 |
| US20130300331A1 (en) | 2013-11-14 |
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